Part of it could be it looks like you have a slight lean uphill, keep your body centered over the board (it may feel like you are leaning downhill, but you will be centered over the board and have increased response and control while turning.) Other than that if you feel you are having trouble more one way than the other, make sure you have equal overhang of your toe and heel over the board, this can give a feeling of tough transition from one edge to the other. Otherwise, it may just come from increased practice.

Edit: Not sure what your stance is set at , but it looks like your shoulders are facing downhill a bit, keep them parallel with the board, if you ride a forward stance, than the shoulder turn may be acceptable.